Display screen or portion thereof with icon



FIG. 1 is a front view of a display screen or portion thereof with icon, showing my new design; and,

FIG. 2 is a front view thereof, as shown in a display screen environment.

The broken lines are for environmental purposes only and form no part of the claimed design. The dot-dash broken lines represent unclaimed boundary lines and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with icon, as shown and described. 